Well tubing snubber



Dec. 22, 1931. H* Q @T15 1,837,990

WELL TUB ING SNUBBER Filed Sept. 26, 1929 Patented sec. 2 2, 1931PATENTy ori-ICE Y HERBERT C. TIS, F SBIREVE'PORT, LOUISIANA WELL TUBING'SNUBBEB;

Application nled September 26, 1929. Serial No. 395,314.

This invention relates to snubbing devices, such as areshown anddescribed-in my .rcopending application, Serial No. 395,315, filed Sept.26, 1929, which discloses a method and 5 apparatus for inserting tubinginto wells against high pressures existing therein.`

The present invention relates to the snubbing devices, one of which isadapted to be moved longitudinally of the tubing in one direction toobtain a grip on thetubing,l

whereby a movement of the said snubbing device, in an oppositedirection, will carry the tubing therewith and force it into the wellagainst the existing ressures therein.

The second snubbing evice is adapted to grip the tubing and hold thesame against movement `in a direction out `of the well by the pressuresexisting inthe well, while the movable snubbing device is being movedalong the tubing to obtain a new purchase thereon.

The construction of the snubbing devices will be fully disclosedhereinafter, reference bein had to the accompanying drawings, 1n whic iFigs. 1 and 2 are respectively a plan view and side elevation of 'themovable snubbing.

f levers 5 and the shoe 10 carried thereby so device; t

Figs. 3 and 4 are respectively a plan view and side elevation of thestationary snubbmg device;

Fig. 5 is a perspective view of one of the snubbingl shoes employed inthesnubblng device shown in Figs. 1 to 4inclus1ve, and 1 Fig. 6 is aperspective view of one of the snubbing levers which support the saidsnubbing shoes shown in Fig. 5. 'Y A Referring to Figs. v1 and2, thestring of tubing being inserted into the'well is indilcated at A. Thismovable snubbing device comprises a carrier -1 composed of a pair` ofsidepmembers 2, 2 located at opposite sides of the tubing A and securedtogether by means of bolts 3 3 and spacing sleeves 4, 4 surrounding saidbolts respectlvely.

Pivotally mounted intermediate the side members 2, 2 of the carrier 1and disposed at opposite sides of the tubing A is a pair ofsnubbinglevers 5, 5, which arel respectively mounted on bars 6, 6 extendingbetween and supported at their opposite ends by the slde members 2, 2.The outer ends of the levers 5, 5 are provided with openings 7,7respectively for the reception of cables or similar means by which thesaid levers may be turned on their pivots to eiect gripping of thetublng A in the manner disclosed in the said copending application. p 1I The inner end of each of the levers 5 isI slotted, as indicated at8,'for the reception 00 of a fin 9 formed on the rear face of a snubbingshoelO, the said end of the lever 5 and the iin 9 being bored asindicated at 11 and 12 respectively for the reception of a'pivot pin 13by which the shoes 10 are pivotally or 65 loosely mounted on the innerends of thesaid levers 5.

The inner faces of the shoes 10, 10 respectively are toothed or serratedas indi- .cated at 14, these faces being concaved and extendingAsubstantially` around the entire outer surface of the `tubing A for thepurpose of distributing the vpressure exerted by the levers 5 to allpoints circumferentially of the said tubing to prevent collapsing of thesaid tubing.

, A spring 415 is provided between each of the n that when the pressureis released from the outer ends of the levers 5 the shoes 10 will 3 bedrawn to and maintained in a predetermined position relative to therespective levers, whereby theconcaved surfaces of the said shoes willbe maintained in substantially parallel relationshi to the tubing A andprovidin for self-a gnment of the said surfaces of t e shoes with thetubing when pressure is `applied to the outer ends of the said levers,the upper rear edge of each of the fins 9 being inclined as indicated at16 for en- 9 gagement with a similarly inclined surface 17 formed in thebase of theslots 8 in the respective levers, when the shoes 10 are notin contact with the tubing.

As indicated in the drawings, the teeth 95 20 formed in the serratedface of each of the shoes 10 are inclined in one direction on one sideof each tooth, the other side of the tooth being substantiallyperpendicular to theplane of the tubing s'o that when the carrler 1 ismoved in one direction along the tubing A the saidteeth will glide orride over the sur- Atthe opposite end of the carrier the side members2a, 2a are secured together by bolts 3b and are spaced apart by a block25 through which the bolts 3b pass.

Intermediate the side frames 2a, 2a is a snubbing lever 5a, pivotallymounted on a 20 pivot bolt 6a, to which is pivoted at 13a a snubbingshoe a of the same general character as that above described, a spring abeing interposed between the lever 5a and shoe 10a for the purposesabove noted.

At the opposite side of the string of tubing A is a shoe which isslidably mounted in the carrier 1a between the side members 2a, 2athereof, the said side framesbeing 3 0 eprovided with` slots 31 whichare adapted t0 receive projections 32, 32 which extend from the oppositesides of the shoe 30 into 4said slots. The shoe 30, like the shoes 10and 10a, is-provided with a serrated concaved surface 33 which isadapted to engage the outer surface of the tubing A. VThe opposite endof the shoe 30 is provided with a socket 34 adapted to receive a head 35formed on one end of a screw-shaft 36 which projects 40 through athreadedaperture formed in the spacing 4block 25, the opposite end ofthe screw-shaft 36 being provided with a.hand\ 4wheel36az by means ofwhich the shaft 36 may' be rotated toeifectmovement of the shoe 30 in adirection longitudinally of the carrier 1a and laterally with respect tothe tubing A. The head 35 of-the screw-shaft 36 .is held within the.socket 34 by means of a plate 37 which is apertured for the passage ofthe shaft 36 and which is secured to the shoe 30Y by means of screws 38,38.

The carrier 1a is adapted to be secured by bolts 40, 40 to a` stationaryobject such as a fitting B appli-ed to the upper end of the well casing.After the movable carrier 1 has been drawn downwardly toward thestationary carrier la thereby forcing the tubing down into the wellcasing B against the pressure existing therein the outer end of thev`lever 5a is forced downwardly by any suit- *able means suchas a cable ora hand bar adapted to be inserted ,in the openings 7a formed in the saidlever for the vpurpose of moving the `'shoe 10a'into contact with the rsurface of the tubing whichV will force the tubing against the serratedsurface of the .be controlled.

' ally of the tubing A for the purpose of permitting the passage ofcouplings or other devices extending beyond the 'outer surface of thetubing A as the tubingl is being forced down into the well casinsavingof gas and oil has been made possible in wells which, prior to myinvention, were permitted to flow freely as no .means had as yet been'perfected which would effect the inserting of tubing into the well bywhich the gas and oil under such high pressure could I claim: r

1. A snubbing device adapted for use in inserting tubing into wellsagainst existing pressures therein, said snubbing device comprising acarrier, a lever pivoted to said carrier, and a shoe loosely mounted onand4 supported solely by one end of said lever and provided with arectilinear toothed surface adapted to grip flatly from end to endthereof the surface of the tubingwhen pressure is applied in onedirection to the opposite end of said lever.

2. '-Ay snubbing device adapted for use in inserting tubing into wellsagainst existing pressures therein, said snubbing device com- -prising acarrier, a lever pivoted to said carrier, anda shoe loosely mounted onone end of said lever and provided with a rectilinear toothed surfaceadapted for self-alignin with and to grip flatly from end to en thereofthe surface of the tubing when pressure is applied in one direction tothe opposite end of saidlever.

3. A snubbing` device adapted for use in inserting tubing into'wellsagainst existing pressures therein, said snubbing device comprising acarrier, a lever pivoted to said carrier, a shoe loosely mounted on oneend of said lever and provided with a rectilinear toothedsurface adaptedfor self-aligning with and to grip atly from end to end thereof thesurface of the tubing When pressureis applied in one direction `to theopposite end of said lever, and resilient means for holding said shoe ina predetermined position relative to the lever when the said pressure is.released from the lever.

4f.v A. snubbing device adapted for use in iinserting tubing into wellsagainst existing pressures thereln, said device comprising a carrier, apair of shoes disposed respectively at opposite sides of the tubing inthe said carrier, each shoe having a longitudinally rectilineartransversely curved serrated surface adapted to engage completely fromend to end and side to side thereof with the surface of the tubing, anda lever pivoted to said carrier and pivotally connected to one of saidshoes for supporting said shoe and for moving said shoe into grippingcontact with said tubing.

5. A snubbing device adapted for use in inserting tubing into Wellsagainst existing pressures thereln, said device comprising a.

carrier, a pair of shoes disposed respectively at opposite sides of thetubing in the said carrier, each shoe having a serrated surface adaptedto engage the surface of the tubing, a lever pivoted to said carrier andpivotally connected to one of said shoes for supporting said shoe andfor moving said shoe into gripping contact with said tubing, means forslidably supporting the other of said shoes on said carrier, and meansfor moving said second shoe laterally with respect to said tubin gHERBERT- C. oTIs.

